they follow the use it or lose it cycle. those cells we don't use simply die but if you didn't know that you're not alone. the new study out today in the journal "frontiers of psychology" found 47% of teachers believed it was true and a whopping two-thirds of all americans agree. >>> and take a look at this all too real video. a mammoth waterspout 140 miles outside sydney, australia. for a sense of its size and power look at that car dwarfed by that giant tornado over open waters. it lasted 15 minutes and packed winds up to 115 miles per hour. eyewitnesses say it sounded like ten freight trains hurtling toward them. thank goodness no one was hurt. boy, what a terrifying sight that was. every day we want to hear what captures your imagination so tweet us your ideas for "instant index @dianesawyer." >>> coming up, watch this, the spitfire lighting up nascar. the race car pioneer holding her own against men. that's next. there's big news. the race car pioneer holding her own against men. that's next. is from the makers of the n